If Everyone Is Telling You He's Bad News, He Probably Is Bad News

Anne Hathaway's relationship with Raffaello Follieri followed a painfully familiar script: Girl falls for boy who seems like a creep to everyone but her. Hathaway even stood by him last year, when a Wall Street Journal story painted him as a criminal. It wasn't until this June, right before the police hauled him away, that she broke free. Sixty-five percent of glamour.com readers have regretted not taking others' opinions about a guy to heart, so all together now: If people who love you really hate him, rethink the romance. His yacht's not worth it.

Good Guys Don't Blab

"Perhaps you didn't understand the last time I told you to stop contacting me, so I'll do my best to spell it out for you. I do not wish to have you in my life anymore." It would sting to hear that in the most private conversation with a guy you broke up with, but imagine you're Jessica Simpson reading it on John Mayer's blog! Along with thousands of other people. Horror. (Mayer was elusive about whom he was addressing, but he and Jessica had just split.) And then he pulled a similar move in August, when, after the demise of his romance with Jennifer Aniston, he felt the need to reveal to reporters that he had dumped her. So, if you find out that your adorable new crush is blogging or gossiping with friends about you or an ex, we say beware. And if your adorable crush is John Mayer? Well, best of luck to you!

For Some Guys, You Come Second. Period.

"I'm the most arrogant person you'll ever meet, and any woman I date has to know that," Terrence Howard said this year. And Terrence-esque John Edwards also admitted he was egocentric and narcissistic when he cheated on his wife, Elizabeth, and thought there'd be "no consequence." Classy. Terrences are handsome, charismatic men; like Edwards, they tend to prefer show-offy fields like politics (see also: Bill Clinton) and entertainment (see: Dave Navarro, John Mayer). Can you date one? Sure, but get a therapist for your emotional needs, cause he won't deal with them.

Cheaters Don't (Usually) Change

Quick math problem: If rumors are true that Mario Lopez cheated on his wife, Ali Landry, and then on his next girlfriend, what's the probability he'd cheat again? Similarly, if Alex Rodriguez had a fling with a stripper and allegedly had other "affairs," including that whatever-it-was with Madge, think he'd do it again? You get the point: Once a cheater, always a cheater. (Unless A-Rod marries Madonna. It kinda feels like no one cheats on Madonna.)

If a Guy Says He Doesn't Ever Want to Get Married Ever, He Probably Doesn't Ever Want to Get Married. Ever.

The entire world knows that George Clooney isn't into marriage—because he says so whenever he can. "I'm not made for marriage," he's said. He bet $10,000 that he wouldn't marry by 40 (and at 47, he still hasn't); the National Enquirer, which knows everything, reported that he keeps an antimarriage shrine in his house. A shrine! And yet his ex-girlfriend Sarah Larson was reportedly devastated by their breakup because "she thought they were getting married," a friend has said. So: If you're dreaming of a white dress and your beloved says things like "I know some married couples…they don't have sex!" (Brody Jenner) or "I compare marriage to communism…. They're both institutions that don't conform to human nature" (Bill Maher, whom we don't want to marry anyway), then you probably have a Clooney on your hands and it's time to move on. After all, there are lots of guys who are man enough to appreciate that long white dress and the hot woman in it.

Romance, Rinse, Repeat!

Drew Barrymore was so happy with her He's Just Not That Into You costar Justin Long in February that she said her cheeks hurt from smiling. Not for long. A few months later, Barrymore, who at 33 has been married two times, was single again, but we have a feeling she won't lose her bounce-back. "I'm a sucker for [romance]," she's said. So is Cameron Diaz, who recovered her love-life optimism soon after breaking up with Justin Timberlake last year. She admitted to feeling "hurt" over that breakup, but was soon rhapsodizing about the possibilities. "Men are the best!" she later exclaimed. We love that try-again resilience—and these women's willingness to walk away from things that aren't perfect. "People think if you're single, you are incomplete," Diaz has said. "I don't want to be in a relationship that makes me incomplete."

Even Beautiful Women Sometimes Get Dumped

It happens all the time to Hollywood's most gorgeous, seemingly perfect women: Their gorgeous, seemingly perfect dudes publicly humiliate them by fooling around with someone else. Jennifer Aniston: probably cheated on. Elizabeth Hurley: definitely cheated on (with a hooker!). And this year Christie Brinkley, supermodel of supermodels, she of the freakishly ageless skin, took her husband to divorce court for cheating on her with his 18-year-old assistant. So, can we all put away that secret belief that good looks lead to happiness? Because it just ain't so.

Recycling an Ex Is Risky

Getting back together didn't work for Nicole Richie and DJ AM or for 67 percent of glamour.com readers, and we're betting it won't work for Pam Anderson and Tommy Lee, who, by our count, are on round four. The only reason to recycle is if you think the time apart has helped you both grow up. Look at the adorable Ryan Gosling and Rachel McAdams, who were back together (at press time) after a year-plus break. Maybe they just needed to get to know themselves a little better—Ryan through testing his acting mettle in indie films, Rachel through kissing actors like Eric Bana in next year's The Time Traveler's Wife. Will it stick? Who knows? You've heard the saying: You have to kiss a lot of Eric Banas before you find your prince. Wait: They don't say that. They say you have to kiss a lot of Wilmer Valderramas. In any case, we're keeping our fingers crossed.